PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 23 (2019) 487–492

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Abstract T paper is fo use on the advanced eva uation of fract re tests of sel cted rock specimens. As essment of fracture response of chevron notch cylindrical specimens of Silesian granite s bjected to three-point bending test was perfor d. The effective c ack model i used and academi softwa e hev oncylinder (author Petr Frantík) based on th finite element met od i pplied for the alyses. Based on the described procedures, estimation of maximum values of the effective fracture toughness are established and discussed. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Abstract The paper is focused on the advanced evaluation of fracture tests of selected rock specimens. Assessment of fracture response of chevron notch cylindrical specimens of Silesian granite subjected to three-point bending test was performed. The effective crack model is used and academic software chevroncylinder (author Petr Frantík) based on the finite element method is applied for the analyses. Based on the described procedures, estimation of maximum values of the effective fracture toughness are established and discussed. 1. Introduction It is more and more evident that the procedures suggested in the well-known and commonly used linear elastic fracture mechanics (LEFM) cannot be used when the typical large zone exists ahead of the crack tip (where more complex non-linear fracture processes occurs). Such a phenomenon is typical for elastic-plastic or quasi-brittle materials. Rocks generally exhibit quasi-brittle behavior, see for instance Bažant and Planas (1998) or Shah et al. (1995). Thus, non-linear fracture models involving the cohesive nature of the crack propagation are necessary when 1. Introduction It is ore d more evident that the procedures suggested in the well-known an commonly used linea elastic fractur mechanics (LEFM) cannot b used when the typical large zone exists ahead of the cr ck tip (where mor complex non-linear fractur processes occurs). Such a phenome on is typic l for elastic-plastic or quasi-brittle materials. Rocks ge rally exhibit quasi-brittle behavior, see for instance Bažant and Planas (1998) or Shah et al. (1995). Thus, non-linear fracture models involving the cohesive nature of the crack propagation are necessary when 9th International Conference on Materials Structure and Micromechanics of Fracture Evaluation of fracture response of Silesian granite specimens via Effective Crack Model approach and finite element analysis 9th International Conference on Materials Structure and Micromechanics of Fracture Evaluation of fracture response of Silesian granite specimens via Effective Crack Model approach and finite element analysis Lucie Malíková a * , Leona Vavro b , Martin Vavro b , Zbyněk Keršner a a Brno University of Technology, Faculty of Civil Engineering, Veveří 331/95, 602 00 Brno, Czech Republic b The Czech Academy of Sciences, Institute of Geonics, Studentská 1768, 708 00 Ostrava-Poruba, Czech Republic Lucie Malíková a * , Leona Vavro b , Martin Vavro b , Zbyněk Keršner a a Brno University of Te hnology, Fac lty of Civil Engine ring, Veveří 331/95, 602 00 Brno, Czech Republic b The Czech Academy of Sciences, Institute of Geonics, Studentská 1768, 708 00 Ostrava-Poruba, Czech Republic Keywords: Granite; Fracture test; Chevron notch; Load – displacement diagram; Effective crack model Keywords: Granite; Fracture test; Chevron notch; Load – displacement diagram; Effective crack model

* Corresponding author. Tel.: +420-541-147-381. E-mail address: malikova.l@fce.vutbr.cz * Corresponding author. Tel.: +420-541-147-381. E-mail address: malikova.l@fce.vutbr.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.133